I was out with my dogs at 03:30am when i heard military jet noises.When i looked up i observed a giant "space craft"that had just passed over me.It was totally silent and i could only see the rear of the craft.It was huge,1000 meters or more wide and shaped like an elongated diamond.On the rear were four round whitish lights with two spaced 400 meters apart on each side like exhaust ports.There were rows of lights that changed colors around the rim of the craft and below it was a single red colored light that blinked off and on. the craft was at 10,000 feet altitude and was moving extremely slow.I was able to watch it for 15 minutes as it slowly moved to the south west.It was very similar to the craft i saw last year (mufon #83761)on the same route.The military aircraft were flying long circles around the craft staying perhaps 15 miles away.One aircraft was always high above the craft.It is hard to believe these crafts exist until you see them for yourself as i have.It was out of this world construction and technology!